achartengine에서 TimeBarChart 만들기

achartengine(http://www.achartengine.org)에는

x축 값이 시간을 사용할 수 있는 TimeChart는 꺽은선 그래프밖에 지원하지 않는다.

BarChart + TimeChart를 합친

TimeBarChart를 새로 정의 하였다.

public class TimeBarChart extends BarChart{

   /** The number of milliseconds in a day. */
   public static final long DAY = 24 * 60 * 60 * 1000;
   /** The date format pattern to be used in formatting the X axis  labels. */
   private String mDateFormat;

   /**
    * Builds a new time chart instance.
    *
    * @param dataset the multiple series dataset
    * @param renderer the multiple series renderer
    */
   public TimeBarChart(XYMultipleSeriesDataset dataset, XYMultipleSeriesRenderer renderer,Type Type,String format) {
     super(dataset, renderer, Type);
     mDateFormat = format;
   }

   /**
    * Returns the date format pattern to be used for formatting the X axis labels.
    * @return the date format pattern for the X axis labels
    */
   public String getDateFormat() {
     return mDateFormat;
   }
  
   /**
    * Sets the date format pattern to be used for formatting the X axis labels.
    * @param format the date format pattern for the X axis labels.
    * If null, an appropriate default format will be used.
    */
   public void setDateFormat(String format) {
     mDateFormat = format;
   }
  
   /**
    * The graphical representation of the labels on the X axis.
    * @param xLabels the X labels values
    * @param xTextLabelLocations the X text label locations
    * @param canvas the canvas to paint to
    * @param paint the paint to be used for drawing
    * @param left the left value of the labels area
    * @param top the top value of the labels area
    * @param bottom the bottom value of the labels area
    * @param xPixelsPerUnit the amount of pixels per one unit in the chart labels
    * @param minX the minimum value on the X axis in the chart
    */
   @Override
   protected void drawXLabels(List<Double> xLabels, Double[] xTextLabelLocations, Canvas canvas, Paint paint, int left,
       int top, int bottom, double xPixelsPerUnit, double minX) {
     int length = xLabels.size();
     boolean showLabels = mRenderer.isShowLabels();
     boolean showGrid = mRenderer.isShowGrid();
     DateFormat format = getDateFormat(xLabels.get(0), xLabels.get(length - 1));
     for (int i = 0; i < length; i++) {
       long label = Math.round(xLabels.get(i));
       float xLabel = (float) (left + xPixelsPerUnit * (label - minX));
       if (showLabels) {
         paint.setColor(mRenderer.getLabelsColor());
         canvas.drawLine(xLabel, bottom, xLabel, bottom + 4, paint);
         drawText(canvas, format.format(new Date(label)), xLabel, bottom + 12, paint, mRenderer.getXLabels());//TODO  getXLabels getXLabelsAngle
       }
       if (showGrid) {
         paint.setColor(GRID_COLOR);
         canvas.drawLine(xLabel, bottom, xLabel, top, paint);
       }
     }
   }

   /**
    * Returns the date format pattern to be used, based on the date range.
    * @param start the start date in milliseconds
    * @param end the end date in milliseconds
    * @return the date format
    */
   private DateFormat getDateFormat(double start, double end) {
     if (mDateFormat != null) {
       SimpleDateFormat format = null;
       try {
         format = new SimpleDateFormat(mDateFormat);
         return format;
       } catch (Exception e) {
         // do nothing here
       }
     }
     DateFormat format = SimpleDateFormat.getDateInstance(SimpleDateFormat.MEDIUM);
     double diff = end - start;
     if (diff > DAY && diff < 5 * DAY) {
       format = SimpleDateFormat.getDateTimeInstance(SimpleDateFormat.SHORT, SimpleDateFormat.SHORT);
     } else if (diff < DAY) {
       format = SimpleDateFormat.getTimeInstance(SimpleDateFormat.MEDIUM);
     }
     return format;
   }
  
  
  
   public static final GraphicalView getTimeBarChartView(Context context,
        XYMultipleSeriesDataset dataset, XYMultipleSeriesRenderer renderer,Type type, String format) {
//      checkParameters(dataset, renderer);
      TimeBarChart chart = new TimeBarChart(dataset, renderer,type, format);
      chart.setDateFormat(format);
      return new GraphicalView(context, chart);
    }
  
  
  
}